A study determined that 60% of women older than age 50 have annual mammograms. A researcher believes that the 60% rate is no longer valid and the proportion should be higher. To see if this proportion is still valid, he surveys 100 women, 75 of whom say they have annual mammograms. if a=0.05, caculate the sample proportion, confidence interval, margin of error, and p value.

In a survey, 26 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $40 and standard deviation of $6. Find the margin of error at a 90% confidence level.

In a poll, 1100 adults in a region were asked about their online vs. in-store clothes shopping. One finding was that 44% of respondents never clothes-shop online. Find and interpret a 95% confidence interval for the proportion of all adults in the region who never clothes-shop online. Click here to view page 1 of the table of areas under the standard normal curve. Click here to view page 2 of the table of areas under the standard normal curve. The 95% confidence interval is from to (Round to three decimal places as needed.)

In a survey, 41 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $36 and standard deviation of $4. Find the margin of error for a 95% confidence level.

In a survey of 2130 adults in a recent​ year, 1491 say they have made a New​ Year's resolution. Construct​ 90% and​ 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals.

If n = 110 and X = 88, construct a 99% confidence interval for the population proportion, p.Give your answers to three decimals <             p             <

Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96

In the construction of an 88% Confidence Interval for a population mean u, a has the value of

In a survey of 2111 adults in a recent​ year, 1244 say they have made a New​ Year's resolution.Construct​ 90% and​ 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. How exactly do you go about doing this